This is one of the points of White's play, although it's less dangerous than it seems at first sight.
7... e7e6  8. d1e1 [%c_effect e1;square;e1;type;Interesting;persistent;true] A subtle move. In addition to taking the knight out of the pin, White has another idea that will soon be revealed. 8... g8f6  9. f2f3  9... g4h5 